Open AccessUltra-wideband high-efficiency reflective linear-to-circular polarization converter based on metasurface at terahertz frequencies
Author(s) -
Yannan Jiang,
Lei Wang,
Jiao Wang,
Charles Nwakanma Akwuruoha,
Weihua Cao
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.027616
Subject(s) - terahertz radiation , optics , wideband , polarization (electrochemistry) , linear polarization , reflection coefficient , circular polarization , energy conversion efficiency , physics , optoelectronics , bandwidth (computing) , electric field , materials science , telecommunications , microstrip , laser , chemistry , computer science , quantum mechanics
The polarization conversion of electromagnetic (EM) waves, especially linear-to-circular (LTC) polarization conversion, is of great significance in practical applications. In this study, we propose an ultra-wideband high-efficiency reflective LTC polarization converter based on a metasurface in the terahertz regime. It consists of periodic unit cells, each cell of which is formed by a double split resonant square ring, dielectric layer, and fully reflective gold mirror. In the frequency range of 0.60 - 1.41 THz, the magnitudes of the reflection coefficients reach approximately 0.7, and the phase difference between the two orthogonal electric field components of the reflected wave is close to 90° or -270°. The results indicate that the relative bandwidth reaches 80% and the efficiency is greater than 88%, thus, ultra-wideband high-efficiency LTC polarization conversion has been realized. Finally, the physical mechanism of the polarization conversion is revealed. This converter has potential applications in antenna design, EM measurement, and stealth technology.